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K8DT-AS

Single-phase Current Relay

K8DT-AS

Our Value Design Products Increase the Value of Your Control Panels. Detect errors in motors and other equipment through current changes. Use in either overcurrent or undercurrent mode.

Input Range

Model Range
*1
Connection
terminal
Setting
range
Input impedance Input type Overload capacity
K8DT-AS1[][] 20 mA
AC/DC
I1-COM 2 to 20 mA
AC/DC
Approx. 5 Ω Direct input Continuous input at
120% of maximum
input.
1 s at 150%
100 mA
AC/DC
I2-COM 10 to 100 mA
AC/DC
Approx. 1 Ω Direct input
500 mA
AC/DC
I3-COM 50 to 500 mA
AC/DC
Approx. 0.2 Ω Direct input
K8DT-AS2[][] 1 A
AC/DC
I1-COM 0.1 to 1 A
AC/DC
Approx. 0.12 Ω
(Load: 0.5 VA)
Direct input or
commercially
available CT
5 A
AC/DC
I2-COM 0.5 to 5 A
AC/DC
Approx. 0.02 Ω
(Load: 1.5 VA)
K8DT-AS3[][] 100 A
AC
I2-COM 10 to 100 A
AC *2
--- OMRON CT Continuous input at
120% with an OMRON
CT(K8AC-CT200L).
30 s at 200%
1 s at 600%
* CT capacity on
primary side.
200 A
AC
I3-COM 20 to 200 A
AC *2
--- OMRON CT

*1. The range is selected using connected terminals.
*2. The K8DT-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT).
       (Direct input is not possible.)

Ratings

Power supply voltage K8DT-AS[][]D: 24 VAC 50/60 Hz, 24 VDC
K8DT-AS[][]A: 100 to 240 VAC 50/60 Hz
Power consumption 24 VAC/DC: 1.8 VA/1 W max.
100 to 240 VAC: 2.5 VA max.
Rated insulation
voltage
600 VAC
Operating value
setting range (SV)
10% to 100% of the maximum value of the setting range
K8DT-AS1:
2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
K8DT-AS2:
0.1 to 1 A AC/DC (Compatible withcommercially available CTs.)
0.5 to 5 A AC/DC (Compatible withcommercially available CTs.)
K8DT-AS3:
When used with the OMRON CT(K8AC-CT200L).
10 to 100 A AC
20 to 200 A AC
Operating value 100% operation at set value
Reset value setting
range (HYS)
5% to 50% of operating value
Reset method Manual reset/automatic reset (switchable)
Note: Manual reset: Turn OFF power supply for 1 s or longer.
Operating time
setting range (T)
0.1 to 30 s
Startup lock time
setting range (LOCK)
0 to 30 s
(The startup lock timer starts when the input has reached approximately 30%
or more of the set value.)
Note: Enabled only for overcurrent operation.
LED Indicators Power (PWR): Green, Output (OUT): Yellow,
Alarm outputs (ALM): Red
Input impedance Refer to Input Range on catalog.
Output form Relay Output: SPDT contact
Transistor Output: 1
Switchable between normally open and normally closed with a DIP switch setting.
Output relay ratings Rated load:
250 VAC 5 A or 30 VDC 5 A (resistive load),
250 VAC 1 A (inductive load),
48 VDC 0.2 A (inductive load)
Minimum load:
5 VDC, 10 mA (reference values)
Mechanical life:
10 million operations min.
Electrical life:
5 A at 250 VAC or 30 VDC: 50,000 operations
3 A at 250 VAC or 30 VDC:100,000 operations
Transistor output
ratings
Rated voltage: 24 VDC (maximum voltage: 26.4 VDC)
Maximum current: 50 mA DC
Ambient operating
temperature
-20 to 60°C (with no condensation or icing)
Storage temperature -25 to 65°C (with no condensation or icing)
Ambient operating
humidity
25% to 85% RH (with no condensation)
Storage humidity 25% to 85% RH (with no condensation)
Altitude 2,000 m max.
Applicable wires Stranded wires, solid wires, or ferrules
Applicable wire size 0.25 to 1.5 mm2 (AWG24 to AWG16)
Wire insertion force 8 N max. for AWG20 wire
Screwdriver
insertion force
15 N max.
Wire stripping length 8 mm
Ferrule length 8 mm
Recommended flatblade
screwdriver
XW4Z-00B (Omron)
SZF 0.4 × 2.5 (Phoenix Contact)
210-719 (Wago)
SDI 0.4 × 2.5 × 75 (Weidmuller)
Current capacity 10 A (per pole)
Number of insertions 50 times
Case color N1.5
Case material PC, UL 94 V-0
Weight Approx. 100 g
Mounting Mounts to DIN Track, or screw mounting
Dimensions 17.5 × 90 × 90 mm (W×H×D)

Specifications

Allowable operating
voltage range
85% to 110% of power supply voltage
Allowable operating
frequency range
50/60 Hz ±5 Hz
Input frequency range K8DT-AS1 and K8DT-AS2:DC input or AC input (45 to 65 Hz)
K8DT-AS3: AC input (45 to 65 Hz)
Overload capacity K8DT-AS1 and K8DT-AS2:
Continuous input at 120% of maximum input, 1 s at 150%
K8DT-AS3:
Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT
(K8AC-CT200L)
Note: Overload capacity of primary side of CT.
Repeat error Operating
value
±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage)
Operating
time
±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable
standards
Conforming
standards
EN 60947-5-1
Installation environment (pollution level 2, Overvoltage category III)
EMC EN 60947-5-1
Safety
standards
UL 60947-5-1 (Listing), Korean Radio Waves Act (Act 10564),
CCC (GB/T 14048.5) *
Insulation resistance 20 MΩ min.
Between external terminals and case
Between power supply terminals and input terminals
Between power supply terminals and output terminals
Between input terminals and output terminals
Dielectric strength 2,000 VAC for one minute
Between external terminals and case
Between power supply terminals and input terminals
Between power supply terminals and output terminals
Between input terminals and output terminals
Impulse withstand
voltage
6 kV (between live terminals and exposed, non-charged metal parts)
Noise immunity Square-wave noise of 1-μs/100-ns pulse width with 1-ns rise time
100 to 240 VAC: 1,500 V power supply terminal common/normal mode
24 VAC: 1,500 V power supply terminal common/normal mode
24 VDC: 480 V power supply terminal common
Vibration resistance Frequency 10 to 55 Hz, 0.35-mm single amplitude
10 sweeps of 5 min each in X, Y, and Z directions
Shock resistance 100 m/s2, 3 times each in 6 directions along 3 axes
Degree of protection Terminals: IP20

* K8DT-AS[]TD is not applied.